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Finding the Fourth Proportional to 399,798.14, 551,721.45 and 218,510.01

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Solution

The fourth proportional to 399,798.14, 551,721.45 and 218,510.01 is: 301,543.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,798.14 : 551,721.45 = 218,510.01 : x
  2. Step 2: Convert to fraction form
    399,798.14/551,721.45 = 218,510.01/x
  3. Step 3: Cross multiply
    399,798.14x = 551,721.45 × 218,510.01
  4. Step 4: Simplify right side
    399,798.14x = 120,556,659,556.72
  5. Step 5: Solve for x
    x = 120,556,659,556.72/399,798.14
  6. Step 6: Final answer
    x = 301,543.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.